SU1458325A1 - Apparatus for biochemical treating of waste water - Google Patents

Abstract

The invention relates to devices for the purification of liquids from organic pollutants, used mainly in sewage treatment plants of populated areas and industrial enterprises. The purpose of the invention is to increase the efficiency and quality of cleaning by improving the conditions for removing excess activated sludge, air saturation and eliminating stagnant zones in the biofiltration chamber. The device comprises a housing 1, divided by longitudinal partitions 3 and 4 into chambers 5,6 and 7 of biofiltration, aera, g / i & ts f in, //; / tsii and upholding. The device is equipped with aerators 17, a thin-layer module 14, collecting trays 22 of purified water and a pipeline 15 for removing excess sludge. The feed water is fed through the channel 18 through the slot 19 to the aeration chamber 6, where it is mixed with the circulating stream of the water mixture, aerated and fed into the biofiltration chamber 5. The flow of the mixture of liquid, excess biofilm and activated sludge flows from chamber 5 through compartment 12 to inclined channel 9, where it is divided into two layers. The bottom layer of activated sludge and biofilm is removed through pipeline 15, one part of the upper layer with a small concentration of sludge enters chamber 6, and the other through thin layer module 14 and tray 22 is removed from the device. The invention makes it possible to increase the productivity and quality of cleaning by increasing the efficiency of the systems for removing and aerating and eliminating stagnant zones in the structure. 1 il. in 36 ffs rm II // L and S (L s: From 00 to tc tn

Description

The invention relates to devices for the purification of liquids from organic pollutants, used primarily in sewage treatment plants of populated areas and industrial enterprises.

The purpose of the invention is to increase the efficiency and quality of cleaning by improving the conditions for removing excess activated sludge, airing and eliminating stagnant zones in the biofiltration chamber.

The drawing shows the device, the cross-section.

The device comprises a housing 1 with a conical bottom 2. In the longitudinal direction, the housing is divided by vertical partitions 3 and A. into chambers biofilter or 5, aeration 6 and standing 7.

The biofiltration chamber is designed for the biochemical oxidation of organic sewage pollution, both by means of a biological film, which is located on the filtering unit 8, and by free-flowing active sludge. Filtration loading 8 represents granules of a lightweight porous material with a density less than the density of water. The lower edges of the longitudinal partitions 3, limiting the biofiltration chamber 5, do not reach the bottom and the upper ends of the partitions of the wide mixture, mix it with the initial liquid and saturate the water with oxygen of the air. They are equipped with aerators 17, made in the form of perforated pipes.

The source water is supplied through the channel 18 through the slot 19 to the aeration chamber 6. In the partitions 3, which restrict the biofiltration chamber, there are slit holes 20 with visors designed to eliminate stagnant zones in the biofiltration chamber 5 at the partitions 3 and to further saturate the liquid with oxygen from the air.

Interconnected partitions 21 and the inner walls of thin-layer modules 14 form prefabricated trays 22 of purified water, partitions 4 and 10 - slotted holes 23.

The device for biochemical wastewater treatment works as follows.

The water to be cleaned is fed through the channel 18 through the slotted opening J9 to the aeration chamber 6. Mixing with the circulating stream of the water-mud mixture, diluted and saturated with air oxygen, the initial waste water enters the biofiltration chamber 5, overflowing through the partition 3 and spreading over the surface of the floating load. With

wives of the top of the side walls of the housing through the filtration of waste liquid

ca 1. Biofiltration chamber 5 communicates with the settling chamber 7 by means of an inclined channel 9 formed by a partition 10 arranged parallel to the conical bottom 2. . The partition II by the lower edge is connected to the bottom of the case, and its upper part does not reach the top of the inclined channel 9 by 0.3-0.4 channel length. This design of the inclined channel 9 allows to intensify the process of sludge compaction and improves the conditions for the removal of excess sludge. The settling chamber 7 is located in the upper part of the housing 1 and is provided with a thin-layer module 14,

Compartment 13 communicates with excess sludge removal pipe 15 using nozzles 16.

Aeration chambers 6 are designed to circulate water 50

55

The organic contaminants are sorbed by the biological film microorganisms and subjected to biochemical oxidation. As the biological film grows on the surface of the filter loading granules and at the same time increases the resistance to movement of the water-based mixture, the load becomes fluidized and the excess and dead biological foam is removed from the load thickness.

The flow of the mixture of liquid, excess biological film and free-floating active sludge flows from the bottom of the biofiltration chamber 5 through the compartment 12 into the inclined channel 9, where it drastically loses speed due to expansion. Due to the stratification, a stratification of the water-water mixture mixture occurs. Two layers of liquid are formed with different concentrations of activated sludge with an interface between them. The bottom layer is a floc of activated sludge and from

0

five

The organic contaminants are sorbed by the biological film microorganisms and subjected to biochemical oxidation. As the biological film grows on the surface of the filter loading granules and at the same time increases the resistance to movement of the water-based mixture, the load becomes fluidized and the excess and dead biological foam is removed from the load thickness.

The flow of the mixture of liquid, excess biological film and free-floating active sludge flows from the bottom of the biofiltration chamber 5 through the compartment 12 into the inclined channel 9, where it drastically loses speed due to expansion. Due to the stratification, a stratification of the water-water mixture mixture occurs. Two layers of liquid are formed with different concentrations of activated sludge with an interface between them. The bottom layer, which is a flake of activated sludge and an excess biological film, moves down the conical bottom and is discharged through the nozzles 16 through conduit 15 for further processing. The upper layer with a low concentration of active sludge enters the settling chamber 7, where the flow of the water mixture is divided into two parts. Due to the airlift effect, most of it enters the aeration chamber 6, where, after mixing with the source water, we oxygenate the biofiltration chamber 5, overflowing through the partition 3 and spreading over the loading surface. The remaining part of the liquid enters the thin-layer module and is brightened in the collection tray 22, then discharged from the device.

As the biological film grows on the surface of the loading granules, it becomes sticky. Due to the walling effect and sticking of the load to the partitions 3, stagnant anaerobic zones are formed. In order to prevent this phenomenon, holes 20 are provided with visors through which part of the water-air mixture from the aeration chamber 6 enters the biofiltration chamber 5. In addition, additional oxygenation of the liquid in the biofiltration chamber occurs.

The invention makes it possible to increase the oxidizing power of the device, the productivity, the quality of the wastewater treatment, as well as to reduce the operating costs by increasing the efficiency of the removal and aeration systems and eliminating stagnant zones in the structure.

Claims (1)

Invention Formula A device for biochemical treatment of waste water, comprising a housing with a conical bottom, divided by vertical, not reaching to the bottom of the housing, longitudinal partitions to biofiltration chambers with floating loading, settling with thin-layer modules, aeration with aerators, inclined channels for supplying the water-feed mixture to settling chambers source water channels and pipelines 5 for the removal of excess sludge, collecting trays of purified water, characterized in that, in order to increase the efficiency and quality of cleaning by improving removal conditions from 0 active sludge, air-saturation and elimination of stagnant zones in the biofiltration chamber, it is equipped with additional longitudinal partitions located in inclined channels for supplying the water mixture and connected to the bottom of the body with longitudinal septa to form the compartment for supplying the water mixture to the sedimentation and removal of excess sludge removal of excess sludge connecting the sludge removal compartments with the sludge disposal pipelines located outside the casing, and the length of the additional longitudinal eregorodok is in the range 0.3-0.4 length of inclined channels in longitudinal - GOVERNMENTAL vertical partitions biofiltration longitudinal chambers are slot apertures with visors and Q longitudinal vertical aeration chamber walls form a slotted openings with inclined channels vodoilovoy feed mixture. 35